1 . Who doesn’t dream of a bright, beautiful, pearly-white smile? It’s something most of us long for — after all, great teeth are a sign of good health, fortune, and youth.     1    . It's people's lifestyles that are contributing to poor tooth health. Here we have listed the worst habits for your teeth.

Avoiding your dentist (牙医)

How often do you go to the dentist?     2     According to reports, around 33 percent of the population in Britain do not visit their dentists as often as they should. This is unfortunate as seeing a dentist regularly is often your first line of defence against more severe dental diseases.

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For some reason, most people get into the habit of moving their brushes back and forth over their teeth. Now, you may think that this is getting rid of all the germs (细菌) but there are actually better methods you should employ. Instead of back and forth, you should be using short, circular movements to brush your teeth.

Not flossing (用牙线清洁牙齿) regularly

    4     However, this simply isn’t the case. Though regular brushing gets rid of the germs on the surface of your teeth, it often has little impact on the food stuck between your teeth, which is all germs need. This is why it is important to floss at least once a day.

Sipping sugary drinks all day

By drinking sugary drinks throughout the day, your teeth are being exposed to sugar for greater amounts of time which can lead to higher levels of tooth decay (蛀蚀) and other oral health issues. So, what should you do? Well, to start with, try to reduce your intake of sugary drinks as much as possible.     5    

2 . Ways to protect eyes from screens

Too much screen time may cause serious eye strain (眼疲劳) and even a sharp decline of eyesight. That's a big problem a lot of people are faced with nowadays, especially those who work on a computer. The following tips may be helpful.

Get regular eye tests

Experts recommend having a comprehensive eye exam every year to detect (探测) problems before they develop. During this test, you should tell the doctor how often you use your phone and your computer.     1     Tell your doctor about it, and your eyes can be tested more accurately at that distance.

Give your eyes space

    2     Studies on computer-related eye strain suggest that screens should be no closer than 40 cm from your face. If this makes it hard for you to read, consider increasing the size of the text rather than moving the screen closer.

Take breaks

This may not always be practical if you're quite busy, but it's important not to stare directly at a screen for too long.     3     While surveys have shown that many office workers take no more than half an hour a day away from their computer, it's recommended that you take a 15-minute break after every two hours spent at your screen.

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Staring at a screen continuously for hours on end may make it difficult for you to focus. To avoid this, many eye experts recommend the “20-20-20 rule” — looking away from your phone/computer screen every 20 minutes and focusing on an object at least 20 feet away for at least 20 seconds. The science behind his trick is that looking at objects at a distance relaxes the focusing muscle in the eye.     5